Possible Sparql BIND bug - 4.1

[Mark James]

Hi Guys,

Since upgrading to stardog 4.1 i've encountered a range of temperamental sparql results for certain kinds of queries. A big one that seems consistently problematic is using bound in a bind variable.  In the following query see the bolded line -

prefix mw: <http://www.xyz.com/moveware/>

prefix sn: <http://api.xyz.com/ontology/acme/>

prefix sm: <http://xyz.com/ontology/event/>

select ?ID ?EDATE ?ETIME ?ETYPE ?ESTATUS ?EASSIGNED ?EID

where {

graph ?g

{?s <http://www.xyz.com/event/ID> ?ID

optional {?event a sm:TASKS_COMPLETED .

         ?event sm:SituationStatus ?eStatus .

         ?event sm:EventEntityID ?eID .

    filter (?eStatus in ('Ongoing'))}

?mwJob a mw:Job ;

     mw:MANAGEREMAIL ?EASSIGNED .

}

filter (?g =  <http://www.xyz.com/COST_UPDATE-7691457526850792123> )

BIND (now() + "PT10H0M0S"^^xsd:dayTimeDuration as ?SYSDATE)

BIND (substr(xsd:string(?SYSDATE),1,10) as ?EDATE)

BIND (substr(xsd:string(?SYSDATE),12,8) as ?ETIME)

BIND ("TASKS_COMPLETED" as ?ETYPE)

BIND (IF(bound(?eStatus), 'Ongoing', 'Started') as ?ESTATUS)

BIND (IF(bound(?event), ?event, 0) as ?EID)

}

The ESTATUS bind will reliably return 'Started' which indicates that the ?eStatus is unbound despite it being bound. To 'fix' the above query I inlined the filter (?g =  <http://www.xyz.com/COST_UPDATE-7691457526850792123> ) line so that the sparql reads - graph  <http://www.xyz.com/COST_UPDATE-7691457526850792123> which seemed to do the trick.

However in other variations of this problem the only way I could fix it was to push parts of the query into a subquery with the bind being in the outer query.

I've since reverted back to Stardog 4.0.5 and the problems have disappeared. So it seems to be quite specific to 4.1.

cheers

Mark

[Pavel Klinov]

Mark,

Thanks for reporting this, we'll fix it for 4.1.1.

Best,

Pavel

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